Now why did I call them that do you suppose? Because traditionally these cookies are made by pushing down with your thumb, but I like a lot of jam in my cookie. That’s my jam I guess. 🙂 The backside of a teaspoon really makes a nice even crater for my cookie and holds a whole bunch of that delicious Bonne Maman Strawberry Preserves. Yum-diddy-yum!!

Ingredients:
- 1 cup unsalted butter (softened to room temperature)
- 1/3 cup sugar
- 1/3 cup light brown sugar, tightly packed
- 1 large egg yolk
- 3/4 tsp vanilla extract
- 2 1/4 cup all purpose flour
- 2 tsp cornstarch
- 1/2 tsp salt
- 1/2 cup sugar for rolling the cookies in (optional)
- 1/3 cup jam or preserves flavor of your choice — I used Bonne Maman Strawberry Preserves. Bonne Maman, Preserve Strawberry, 13 Ounce
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Instructions:
- Place room temperature butter in the bowl of a stand mixer (you can also use a large bowl and an electric hand mixer) and beat until creamy.
- Scrape down the sides of the bowl, add sugars, and beat, gradually increasing mixer speed to medium-high until ingredients are well-combined (about 30-60 seconds).
- Add egg yolk and vanilla extract and beat well.
- In a separate bowl, whisk together flour, cornstarch, and salt.
- With mixer on low speed, gradually add flour mixture to wet ingredients until completely combined. This dough will seem very dry and crumbly, so be sure to pause occasionally to scrape the sides and bottom of the bowl. If it starts to strain your mixer you can use your hands to finish working the dough together.
- Scoop cookie dough into 1 Tablespoon-sized ball and roll very well (so that the dough is round and there are no cracks/seams in the cookie dough — this will help keep your thumbprints from cracking).
- Roll in granulated sugar (if using) and place on a wax-paper covered plate or small cookie sheet. Use your thumb (or the rounded back of a teaspoon like I did) to gently press an indent in the center of the cookie dough. Repeat until all of the dough has been used.
- Transfer cookie dough to freezer and chill for 30 minutes.
- Once dough is done chilling, preheat oven to 375F (190C) and place your jam in a small microwave-safe bowl. Heat briefly (about 5-10 seconds) or until jam is not hot but is no longer firm and is easy to stir.
- Spoon jam into each thumbprint, filling each indent to the brim.
- Once oven is preheated, place cookies at least 2″ apart on a parchment paper-lined cookie sheet and bake on 375F (190C) for 11 minutes or until edges are just beginning to turn golden brown.
- Allow cookies to cool completely on baking sheet before enjoying.
Recipe from: Sam Merritt of Sugarspunrun.com
Perfect little shortbread cookies with the perfect amount of jam in the center. Use a high quality jam because these tasty treats and your family and friends all deserve the best!